Portion of a rifle



FIG. 1 is a front top perspective view of a portion of a rifle according to the new design;

FIG. 2 is rear bottom perspective view thereof;

FIG. 3 is a left elevation view thereof;

FIG. 4 is a right elevation view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a front elevation view thereof; and,

FIG. 8 is rear elevation view thereof.

All broken lines shown in the drawings are for illustrative purposes only and form no part of the claimed design. 

CLAIM The ornamental design for a portion of a rifle, as shown and described. 